Mayhew Pro 37316 1/2-Inch Shake 'n Break Pneumatic Bolt Breaker Attaches to air hammer to provide vibration while removing stubborn/frozen fasteners or Torx bolts/nuts To be used with impact sockets Built-in hex on shaft of tool to be used in conjunction with open-end wrench when loosening stubborn fastener Applications include bearing removal and gm caliper removal Made in the USA